When the operator begins to lower the load, this stored energy gives the counterbalance valve the message that a heavy load is on the boom, and less pilot pressure is required to open the counterbalance valve. . . . 5-29 5-7. If used, remove the lifting device from the upright or remove the prop from below the boom, activate the hydraulic system and run the cylinder through one complete cycle to check for leaks. A counterbalance valve can easily be described as a pilot operated relief valve with a free flow check. Problem Possible Cause Solution Shaft rotates slowly or not at all Insufficient torque output Low rate of fluid flow Counterbalance valve has internal leakage Leak in piston and/or shaft seal Corrosion build-up on the thrust surfaces . It can also be used The counterbalance valve is located in a line between a directional control valve and the vertically mounted actuator/cylinder. . . . The load will not “run away” due to the effects of external forces, such as gravity. Note: Bimba cylinders are grey in color, HPI are black and do not require the check valve. Troubleshooting Challenge: Pressure Poses Problem. New counterbalance valve was fixed. . Troubleshooting A Counterbalance Valve . . The incorrectly plumbed counterbalance valve failed to open, thus preventing any flow from getting to the motor. CBF hydraulic produces hydraulic overcenter valves, counterbalance valves, check valves, flow control valves, pressure control valves, relief valves contact us: +39 0444.499.141 email: info@cbfhydraulic.com Corrective Action: Check for leaks on the top of the cylinder. . Individual product data sheets are available for download on product catalog pages. Free Knowledge For All. The valve must be replaced if a steady flow of fluid is seen coming from the valve … The counterbalance valve working principle states that the fluid will be trapped inside the spool under pressure until the pilot pressure overcomes the pre-set value. . . The name counterbalance came from the counterbalancing weights used in the earlier machine tools to prevent the ball screw from coming under heavy load. Robert Sheaf. Counterbalance Valve Application. Counterbalance valve act as a hydraulic restrictor to hydraulic cylinder. 90° Fitting: connection point for the hydraulic hose. . Finally, it prevents the loss of an excess amount of oil in the event of a … Valve Sticks or Works Hard Tie bolts too tight on valve stacks. 9. The Ten Step Troubleshooting Process is taught with the goal of eliminating the "hit or miss" methods that can be so costly in terms of time and materials. . Once the plumbing was corrected, the motor turned freely and predictably. The relief valve opens when the combined force created by the pilot pressure and the load-induced pressure The counterbalance valve is used with suspended and overrunning type loads. Use manufacturer™s recommendation to adjust tie bolt torque. . Try your luck with this month's reader challenge. FM 5-499 v Page 5-6. . . . A counterbalance valve will only open enough to allow the load to move at the desired flow rate, thus preventing the load from over-speeding the pump. With the pump functioning normally, the external solenoid valve is closed to ensure that the load is not lowered due to the pilot supply oil flow requirement of approximately 1 l/min [0.26 US gal/min]. The method I describe for troubleshooting the cylinder and the valve though is as I … . Download product catalogs, application white papers, product certifications, installation instructions and manuals. Locate source of contamination that caused scoring. The counterbalance valve will hold a load in position until pressure or an external force is applied to move the load. . Thus preventing air from passing past the rod seals and into the cylinders. . The following illustration shows a counterbalance valve schematic. In addition, fluid flow rate must be controlled in various lines of a hydraulic circuit. If a counterbalance valve is used to support a cylinder, the total pressure at the cylinder side of the valve is a sumation pressure required to overcome the spring force plus any pressure drop caused by the flow of oil through the valve. . KMW Ltd. 198 N. Hwy 281 Great Bend, Kansas 67530 800 445-7388 Fax 620 793 -6737 ïïïK âãïäç~ÇÉêëKÅçã TROUBLESHOOTING SECTION OPERATORS MANUAL Valve Assembly. If the replacement cylinder is a Bimba brand you must remove the brass filter [1] and install the 58-1863 Check Valve [2]. 1.6) is applied to create a back pressure or cushioning pressure on the underside of a vertically moving piston to prevent the suspended load from free falling because of gravity while it is still being lowered. . Page 96: Cylinders With Dual Counterbalance Valves 7. A counterbalance valve (Fig. With your fingers, tighten the gas chuck [1] on the charge/discharge kit to the Schrader valve [2]. . C-Series Operator Manual 7-5 Chapter 7: Hydraulic System Troubleshooting Check for and remove any obstruction in return line. This valve can also be used with hydraulic motors and is then commonly referred to as a "brake valve". Valve broken or scored internally. Use a dab of Teflon thread sealant on the check valve threads [3]. … . Pressure relief valve, pressure reducing, sequence, unloading and counterbalance valve are different types of pressure control valves. Basic Hydraulic Troubleshooting is written for electricians, millwrights, supervisors, reliability technicians and anyone who is responsible for the hydraulic maintenance of plant machinery. This fully-illustrated color manual contains nearly 300 pages of troubleshooting and reliability procedures. A counterbalance valve is a modulating valve that can maintain an actuator movement at a desired flow rate. . The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. Turning the adjusting screw clockwise will increase the load carrying capacity of the valve. This motion controlling marvel is the successor of the counterbalance valve. A Excessive Noises 1. valve oscillates and excites the other control elements to oscillation 2. flow noises 3. as 3 A 7 1. valve chatters, due to defective solenoid, or the voltage is too low 2. valve defective due to dirt or wear 3. through flow excessive 4. pilot pressure variations 5. The counterbalance valve shown has an integral check valve. . Contact Your Distributor > First, it is a holding valve. They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. Note: Make sure you turn the T-handle of the gas chuck fully counterclockwise. Repair or replace valve. Threaded Rod End: connects to the spindle head bracket. Secondly, it is designed to control the speed at which the lowering function operates, and allows that motion to be metered under load. System analysis and troubleshooting skills are taught using the circuits and schematics on a coiled tubing unit. Optional manual and flush manual release. . Use the bottom valve. Troubleshooting Guide MAINTENANCE AND TROUBLESHOOTING * Replacement parts may be needed. . When there is no pressure applied to the full piston side of a cylinder (figure 1), the valve will maintain oil in the rod side. . . The built-in check valve prevents the oil from flowing via the pressure adjustment spool to tank. . (a) The counterbalance cartridge addresses air ingestion by preventing the implements series cylinders from running ahead of the oil supply. If there is no leak, recharge the nitrogen: Remove the cap [1] from the Shrader valve. . . . Counterbalance valve typically installed in line between directional control valve and a vertically mounted hydraulic cylinder actuator. Schrader Valve: allows you to add or remove pressure. . counterbalance valve. Generally what I've worked on for counterbalance valves work on both sides of a circuit. For example, the control of actuator speeds depends on … . Downloads from ROSS Controls. It was found 2 out of 4 throttle was partially open, it was mistake of the painter who partially kept open the valve for his convenient while painting. ... Troubleshooting Valve spool scored. A counterbalance valve will re-set and lock system pressure in the cylinder irrespective of the load-induced pressure. 7. . What to Talk to Someone? The lifeguard, however, for any hydraulic actuator, is the overcenter valve. In various lines of a circuit tight on valve stacks used with and! 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